Effect of Surface Roughness on Oxidation Resistance of Stainless Steel AISI 316Ti During Exposure at High Temperature
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JMEPEG https://doi.org/10.1007/s11665-020-05267-x
Effect of Surface Roughness on Oxidation Resistance of Stainless Steel AISI 316Ti During Exposure at High Temperature Wojciech J. Nowak Submitted: 29 July 2020 / Revised: 1 October 2020 / Accepted: 9 October 2020 In the present work, the influence of surface roughness on oxidation kinetics of AISI 316Ti stainless steel and its consequences in term of oxidation resistance were investigated. Namely, the effect of surface roughness on oxidation resistance was evaluated during different types of cyclic oxidation tests at 900 and 1000 °C. The obtained results revealed that alloy possessing higher surface roughness showed longer lifetime compared to that with lower surface roughness. It was also found that more severe cyclic conditions suppressed the positive effect of surface roughness on sampleÕs lifetime. The better oxidation resistance of rougher alloy was correlated with suppressed formation of Fe-rich nodules on ground surfaces and explained by the combined effect of introduced defects in the near-surface region and possible increase in residual stresses caused by mechanical surface preparation. Keywords
cyclic oxidation test, high temperature oxidation, lifetime, oxidation resistance, stainless steel, thermal shock test
1. Introduction The metallic materials are widely used as construction materials in various sectors in industry. The largest sectors, where metallic materials are widely used, are energy production, aviation and automotive sectors. In all mentioned sectors, the materials face very high temperature. Fe-based alloys are the most commonly used as construction materials. However, the exposure of Fe-based alloys at high temperature results in high temperature gas corrosion. To increase the oxidation resistance, Cr and Ni are added into alloys to produce stainless steels. Then, due to high content of Cr, stainless steels can be classified as ‘‘chromia’’ forming alloys (Ref 1), i.e., during the exposure at high temperature, they form slowly growing Cr2O3 scale, which is protective up to 1050 °C. It was shown that above 1050 °C chromia scale loses its protective properties due to volatile species formation (Ref 2, 3). Then, potentially, stainless steels can be successfully used at high temperature. One of the family members of stainless steel is AISI 316Ti. The addition of Ti enables stabilization of the alloy structure at temperature exceeding 800 °C (Ref 4). Several studies were performed on stainless steel grade 316, e.g., in supercritical water conditions (Ref 5), in water at elevated temperature (Ref 6, 7), under low temperature carburization conditions (Ref 8) or during low temperature corrosion testing (Ref 9). It is known that increase in operating temperature results in increase of Wojciech J. Nowak, Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszo´w University of Technology, Powstanco´w Warszawy 12, 35-959 Rzeszow, Poland. Contact e-mail: [email protected].
Journal of Materials Engineering and Performanc
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